A/2019 G2
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	6 Dec 2019	20.7	2.309 AU	1.924 AU	10h59m	+33°35'	100.0°	24.9°	290°
Nearest approach	9 Jan 2020	19.8	2.342 AU	1.464 AU	08h19m	+54°52'	145.5°	13.8°	204°
Today	14 Dec 2025	28.8	16.523 AU	16.581 AU	23h34m	-16°53'	84.9°	3.4°	67°

The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. The displayed light curve is calculated under the assumption that the object remains inactive. (H=16.30; G=.15).

Charts

The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Orbital elements

The orbital elements of A/2019 G2 are:

    e (Eccentricity)                : 0.9942850
    q (Perihelion distance)         : 2.3086500
    i (Inclination)                 : 159.26390
    Ω (Longitude of ascending node) : 208.26080
    ω (Argument of perihelion)      : 82.83670
    L (Longitude of perihelion)     : 125.91458
    B (Latitude of perihelion)      : 20.56689
    T (Time of perihelion passage)  : 2458823.71700
    P (Orbital period in years)     : 8119.19

    Epoch                           : 2025 Nov 12
    Reference                       : MPEC 2024-E01

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-13 00:00 UT   23 34 10.8   -16 54 17    16.544   16.514   86.5    3.4    67   28.8 
2025-12-14 00:00 UT   23 34 09.3   -16 53 42    16.566   16.519   85.5    3.4    67   28.8 
2025-12-14 15:44 UT   23 34 08.4   -16 53 18    16.581   16.523   84.9    3.4    67   28.8 
2025-12-15 00:00 UT   23 34 08.0   -16 53 05    16.589   16.525   84.5    3.4    67   28.8 
2025-12-16 00:00 UT   23 34 06.9   -16 52 28    16.611   16.530   83.5    3.4    68   28.8 
2025-12-17 00:00 UT   23 34 06.1   -16 51 48    16.634   16.536   82.6    3.4    68   28.8 
2025-12-18 00:00 UT   23 34 05.6   -16 51 08    16.656   16.541   81.6    3.4    68   28.8 
2025-12-19 00:00 UT   23 34 05.3   -16 50 26    16.679   16.547   80.6    3.4    68   28.8 
2025-12-20 00:00 UT   23 34 05.2   -16 49 43    16.701   16.552   79.6    3.4    68   28.8 
2025-12-21 00:00 UT   23 34 05.4   -16 48 59    16.723   16.558   78.6    3.3    69   28.8 
2025-12-22 00:00 UT   23 34 05.8   -16 48 13    16.746   16.563   77.6    3.3    69   28.8 
2025-12-23 00:00 UT   23 34 06.4   -16 47 26    16.768   16.569   76.6    3.3    69   28.8 
2025-12-24 00:00 UT   23 34 07.3   -16 46 38    16.790   16.574   75.7    3.3    69   28.8 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.